#1  
Old 06-25-2008, 08:28 AM
Peasant
 
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Default Best way to clean mortar off stone & Brick?

Just wondering the best way?

Thx.
B
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Old 06-25-2008, 10:53 AM
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Default Re: Best way to clean mortar off stone & Brick?

Rockwallgriller

The posts Ive seen said to use "muratic" acid if the mortar is really dried/set. Pretty scary stuff. I think I might try to use it on my outer decorative arch...

Thanks
Dick
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Old 06-25-2008, 11:07 AM
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Default Re: Best way to clean mortar off stone & Brick?

For what it's worth, muriatic acid is another (older) name for hydrochloric acid. We probably all used it in high school chemistry class, so while some caution is warranted, it's not that scary.

Gloves, goggles, and old clothes for sure.
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Old 06-25-2008, 11:53 AM
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Default Re: Best way to clean mortar off stone & Brick?

I used a pressure washer, but I was SUPER careful not to let the high pressure stream hit the joints.

Malinda
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Old 06-25-2008, 01:49 PM
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Default Re: Best way to clean mortar off stone & Brick?

Make sure you dilute the hydrochloric acid. About 15:1 I think
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Old 06-25-2008, 01:56 PM
Peasant
 
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Default Re: Best way to clean mortar off stone & Brick?

I've read it's 10:1 ratio....
Then what? Spray on let it sit then scrub with wire brush, then wash off with garden hose?
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Old 06-25-2008, 05:18 PM
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Default Re: Best way to clean mortar off stone & Brick?

Still scary stuff to me... I can never remember which to add first, water or acid. For that matter, I can't remember which battery cable to hook up first...


Dick
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Old 06-25-2008, 06:25 PM
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Default Re: Best way to clean mortar off stone & Brick?

Quote:
Originally Posted by thebadger View Post
Still scary stuff to me... I can never remember which to add first, water or acid. For that matter, I can't remember which battery cable to hook up first...


Dick
Do your remember which to lay first?


Brick or mortar?

Is that like the chicken and the egg thing?
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Old 06-25-2008, 06:26 PM
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Default Re: Best way to clean mortar off stone & Brick?

Quote:
Originally Posted by Rockwallgriller View Post
I've read it's 10:1 ratio....
Then what? Spray on let it sit then scrub with wire brush, then wash off with garden hose?
I would like to know the answer too!
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Old 06-26-2008, 03:57 AM
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Default Re: Best way to clean mortar off stone & Brick?

Clean it off while it's wet...use a sponge with a scrubbie on the other side or a scrub brush!

OK ok....it's hard and you want it off.

Understand that the muriatic / hydrochloric acid is dissolving the mortar by chemically attacking it. It should not impact the firebrick since it's vitrified. You put the chemical on the mortar and let it do it's work. It will dissolve it from the outside in. Using a scrub brush will help remove the outer layer of mortar (sand) and let the acid work it's way down. It's actually fizzing.....make sure you don't have any limestone or marble nearby!

Rinse it off when done.

Goggles and gloves for sure!
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